Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 99
subjected to a temperaturesuch that at the end of four hours it was com-pletely soft and on the point of melting, when thefire was slackened. After the crucible had beenallowed to cool it was carefully broken open, thepipe-bowl was found to be entire, with the char-coal in it as black as at first;… … Fig. 30.—Maillards Experiment. perature of a porcelain furnace, resisted the heatlike the preceding. Analogous experiments were made in differentparts of Europe, sometimes with the one, sometimeswith the other of the preceding results. The factsremained inexplicable till—on the principal pheno-…
Precious stones · Diamonds · Gems
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